troubleshooting Question

SMTP Send Logs and Spam

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cfwirth asked on
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I believe we are having spam sent through our Exchange 2007 server.  Below is an excerpt from one of the SMTP send logs.  I have made a configuration change in our Sonicwall firewall to only allow outbound SMTP port 25 to be used by the Exchange server but I am still seeing in the SMTP send logs messages with a MAIL FROM: <>.  Is it possible that the either the Exchange server has a spam bot or that it is being used as an open SMTP relay?  I thought SMTP relay was turned off by default. We have been blacklisted only by at this time. How would I go about trying to figure what the problem is? Thanks.,,>,MAIL FROM:<> SIZE=11126,,,>,RCPT TO:<>,,,<,250 2.0.0 Reset state,,,<,250 2.1.0 <>... Sender ok,,,<,250 2.1.5 <>... Recipient ok,,,>,DATA,,,<,"354 Enter mail, end with ""."" on a line by itself",,,<,451 4.3.2 Please try again later,,,>,QUIT,
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